Cars HobbyWing XR8 and 1900kv motor stops/starts

so this past weekend i had 2 separate HWXR8/1900kv combos crap on me. The car ran well well for 4 five minute practice sessions then would power off and a few seconds later power back on. Obviously, driving a 1/8 buggy at full speed down the straight is a bit hairy not knowing when i will lose all power and small the wall at the end of the straight. With my old XR8 esc the hobby shop told me it was the switch and to cut and pair the 2 red wires together to take the switch out of the equation. this seemed to work but for only 2 five minute race sessions. one RC racer said they it could be the sensor wire. but i removed the older one from my truggy, that was running fine, and it had a broken sensor wire. so now i am thoroughly confused on what actually is the problem. HELP
 
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